{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\hline\hline
                &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\hline
S=1 $\times$ T=1&   -0.019         &   -0.112         &   -0.130\sym{**} &   -0.258\sym{**} \\
                &  (0.076)         &  (0.133)         &  (0.054)         &  (0.111)         \\
S=1 $\times$ T=1 $\times$ electoral\_period=1&   -0.169\sym{**} &   -0.228\sym{*}  &                  &                  \\
                &  (0.080)         &  (0.132)         &                  &                  \\
S=1 $\times$ T=1 $\times$ term\_limit=1&                  &                  &    0.106\sym{*}  &    0.179         \\
                &                  &                  &  (0.063)         &  (0.127)         \\
\hline
Observations    &    16314         &    16282         &    16544         &    16511         \\
\(R^{2}\)       &    0.231         &    0.235         &    0.228         &    0.232         \\
\hline\hline
\end{tabular}
}
